6 Numbers Founders Should Check Before Every Big Spending Decision
Sam's List Editorial | 2026-07-20
Most founders make big spending calls off one number: the balance in the business checking account. It is the fastest way to feel rich on a Tuesday and get blindsided on the fifteenth.
The bank balance is a snapshot of money that has already arrived, not money you actually get to keep. Before you sign a lease, hire a role, or buy a quarter of inventory, these are the six numbers that tell you whether the yes is safe.
1. Cash Runway in Weeks, Not the Bank Balance
Runway is how long your cash lasts at your current burn, and it is the number the bank balance pretends to be. Take your cash on hand, subtract what is already committed, and divide by your average weekly net burn.
If a hire adds burn, rerun it with the new number. A decision that shortens runway from twenty weeks to eight is a different decision than the one you thought you were making. The point is not to never spend. It is to know the runway you are trading away.
2. Committed vs. Available Cash
Your balance includes money that is already spoken for: next payroll, sales tax you are holding, payroll taxes, and bills you have received but not paid. That is committed cash, and spending it twice is how solvent businesses miss a payroll.
Available cash is what is left after you set the committed pile aside. Make big decisions against that number. It is almost always smaller and far more honest than the balance on your dashboard.
3. Contribution Margin on What the Spend Is Meant to Grow
If the spend is supposed to drive more sales, you need to know what a sale actually keeps. Contribution margin is revenue minus the variable costs of delivering it, and it tells you whether growth funds itself or quietly drains you.
A new salesperson who books low-margin work can grow revenue and shrink cash at the same time. Check the margin on the specific thing you are trying to scale, not your blended average, which hides the weak lines behind the strong ones.
4. Trailing Collections, Not Revenue Booked
Booked revenue is a promise. Collections are the cash that showed up. If your customers pay in forty-five days, a great sales month is a cash problem two months out, right when the new expense hits.
Look at what you actually collected over the last several weeks and the trend line. Spending against invoices you have sent but not been paid for is one of the most common ways a profitable business runs short.
5. The Tax Reserve You Have Not Funded Yet
Profit is not spendable until the tax on it is set aside. A strong year with no reserve is a balance that looks generous in October and evaporates the following April.
Before a big spend, confirm your estimated tax reserve is current. If it is not, part of the cash you are about to commit belongs to the IRS, and treating it as available is borrowing from a bill that always comes due.
6. Payback Period on the Decision Itself
Every big spend is an investment, so ask how long until it pays for itself. A hire, a piece of equipment, or an inventory buy should have a rough payback window you can defend.
A three-month payback is a very different risk than an eighteen-month one, especially on short runway. Payback math will not make the decision for you, and estimates can be wrong, but a spend you cannot even estimate a payback for is usually a spend you are not ready to make.
Turning These Into a Habit
None of these numbers help if you only find them during a crisis. The founders who make good spending calls have books clean enough to pull runway, committed cash, and margin on a random Wednesday, not three weeks after the fact.
That is the practical case for a bookkeeping and accounting partner that thinks like an operator. Good Operator is a West Hollywood firm built around exactly that idea: run your cash the way an operator would, with full-stack accounting, business intelligence, and fractional CFO work aimed at your cash cycle and margins rather than just a clean tax return.
Good Operator has 31 verified client reviews on Sam's List as of 2026-06-26. Reviews reflect the experiences of individual clients, do not represent an endorsement by Sam's List, and are not indicative of future results.
The trade-off is real. An operator-style engagement is more than a founder who only needs a once-a-year filing should pay for, and no bookkeeper can make a thin-margin decision safe. What a good one does is put these six numbers in front of you before the decision, not after. You can compare firms and their verified reviews in the Sam's List accountant directory.
Frequently Asked Questions
What financial numbers should I check before hiring? Check your real cash runway with the new salary included, your available cash after committed obligations, and the contribution margin on the work the hire will do. A hire that shortens runway sharply or books low-margin revenue can grow the top line and shrink cash at the same time.
How do I calculate cash runway? Take your cash on hand, subtract cash already committed to payroll, taxes, and unpaid bills, then divide by your average weekly net burn. The result is roughly how many weeks you can operate at the current rate. Rerun it whenever a decision changes your burn.
Why is my bank balance a bad way to make decisions? Because it mixes money you get to keep with money already spoken for, including upcoming payroll, sales tax you are holding, and unfunded tax reserves. Spending against the balance often means spending cash that already belongs to someone else. Available cash is the safer number.
Do I need a bookkeeper to track these numbers? Not strictly, but you need books current and accurate enough to pull them on demand. Many founders find that a bookkeeper or accountant is what makes these numbers reliable and fast to get, which is the whole point of checking them before a decision rather than after.
About the author: Kimberly Green is the cofounder of Sam's List, where business owners and high earners find vetted CPAs, financial advisors, and fractional CFOs. She's met one-on-one with 400+ financial professionals and writes from the real data behind thousands of client-advisor matches. Ask her anything about finding an accountant - she's heard it all, including the questions people are afraid to ask.